Question 486:

• JAMB 1988

When taking a penalty kick, a footballer applies a force of 30.0N for a period of 0.05s. if the mass of the ball is 0.075kg, calculate the speed with which the ball moves off.

A. 4.50ms^-1
B. 11.25ms^-1
C. 20.00ms^-1
D. 45.00ms^-1

Question 487:

• JAMB 1988

A particle starts from rest and moves with a constant acceleration of 0.5ms^-2. The distance covered by the particle in 10s is

A. 2.5m
B. 5.0m
C. 25.0m
D. 50.0m

Question 488:

• JAMB 1988

A 20-toothed gear wheel drives a 60-toothed one. If the angular speed of the smaller wheel is 120 rev s^-1, the angular speed of the larger wheel is

A. 3 rev s^-1
B. 40 rev s^-1
C. 360 rev s^-1
D. 2400 rev s^-1

Question 489:

• JAMB 1988

How long will it take a 60kg man to climb a height of 22m if he expended energy at a rate of 0.25kW. [g = ms^-2]

A. 5.3s
B. 34.5s
C. 41.6s
D. 52.8s

Question 490:

• JAMB 1988

A force, 10N, drags a mass 10kg on a horizontal table with an acceleration of 0.2ms^{[/sup]. If the acceleration due to gravity is 10ms[sup]-1}, the coefficient of friction between the moving mass and the table is

A. 0.02
B. 0.08
C. 0.20
D. 0.80